A sampling device and method for metal sheath of ultra-high voltage metal sheathed cable

Abstract

The invention relates to a metal sheath sampling device and a sampling method for an ultra-high voltage metal sheath cable; the device comprises a fixed platform, and a left upper clamping plate and a right upper clamping plate respectively installed on both sides of the fixed platform; a left guide slot opening and a right guide slot opening are symmetrically arranged on the fixed platform along its length direction; a suspended fixed bracket is arranged between the left guide slot opening and the right guide slot opening; a left lower clamping plate is correspondingly installed at the bottom of the left upper clamping plate; and a right lower clamping plate is correspondingly installed at the bottom of the right upper clamping plate; the invention has a simple structure and an ingenious design. Compared with the prior art, the device of the invention replaces manual labor and adopts a longitudinal cable metal sheath sampling device, which can save costs, reduce waste, improve the reliability and accuracy of cable sampling, and is suitable for cables of different diameters. When the device is used for cable sampling, it is simple to operate, easy to use, and has high operating safety, which can reduce injuries to personnel during operation, and at the same time effectively controls the cutting depth of the metal sheath to avoid damaging the cable core.

Description

Technical Field

[0001] The invention belongs to the technical field of auxiliary tools for electric wires and cables, and in particular relates to a metal sheath sampling device and a sampling method for an ultra-high voltage metal sheath cable. Background Art

[0002] Ultra-high voltage metal sheathed cables are used to transmit and distribute electrical energy. They are commonly used in urban power grids, power station lead-out lines, external power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seas.

[0003] In recent years, due to the comprehensive planning and design of cities and the popularization of electrical applications, high-voltage and ultra-high-voltage power cables are used in many fields, and the length and performance of cables have increased significantly. In order to facilitate the development of industry, the electric power industry and scientific researchers have strengthened the research on ultra-high voltage smooth metal sheathed cables. High-voltage and ultra-high voltage power cable technology requires longer transmission lines, which must be able to adapt to complex and harsh environments, and ensure the stability and safety of power supply during transmission, which is more conducive to the development of high-voltage and ultra-high voltage cables.

[0004] The metal sheath of the ultra-high voltage metal sheath cable has two major functions: (1) Waterproofing: prevent XLPE insulation from contacting water and generating water treeing. The metal sheath is the radial waterproof layer of the cable; (2) It can withstand zero-sequence short-circuit current and has good thermal stability. During manufacturing, it is necessary to test and control the quality of each link in the cable production. One of the production links is to conduct metal sheath weld tensile comparison and metal sheath and outer sheath adhesion test on the ultra-high voltage metal sheath cable before the ultra-high voltage cable leaves the factory. At present, the metal sheath of the ultra-high voltage metal sheath cable has the following structures: smooth aluminum sheath, smooth copper sheath, smooth stainless steel sheath, smooth lead sheath, corrugated aluminum sheath, corrugated copper sheath and corrugated stainless steel sheath. After the ultra-high voltage cable is produced, the smooth metal sheath of the ultra-high voltage metal sheath cable and the outer sheath bonded together are sampled before testing. It seems to be a small link, but it is actually of great significance to the safety of the cable's later operation. The most commonly used method in the industry is to use reciprocating saws or hacksaw blades for manual sampling, which is time-consuming and labor-intensive, the sampling does not meet the standard requirements, and the error is large. During the sampling process, the insulating core inside the cable is greatly damaged, which sometimes leads to failure of the high-voltage test, and sometimes the test is barely qualified due to minor damage, but it reduces the service life of the cable. Therefore, there is an urgent need for a cable sheath stripping device that can change the damage to the cable core caused by manual sampling of the metal sheath of the ultra-high voltage metal sheathed cable, thereby reducing the labor intensity of the cable, saving time, and effectively controlling the cable from damage, thereby ensuring the quality of the ultra-high voltage cable.

[0005] In view of the above technical problems, improvements need to be made. Summary of the invention

[0006] The present invention aims to overcome the defects in the prior art and provides a metal sheath sampling device and a sampling method for ultra-high voltage metal sheathed cables which have a simple structure, ingenious design, no manual cutting operation and can adapt to cables of different diameters.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is: a metal sheath sampling device for ultra-high voltage metal sheathed cable, comprising a fixed platform, an upper left clamping plate and an upper right clamping plate respectively installed on both sides of the fixed platform; a left guide slot and a right guide slot are symmetrically arranged on the fixed platform along its length direction; a suspended fixed bracket is arranged between the left guide slot and the right guide slot; a lower left clamping plate is correspondingly installed at the bottom of the upper left clamping plate; the upper left clamping plate and the lower left clamping plate are locked by a left connecting mechanism, and a lower right clamping plate is correspondingly installed at the bottom of the upper right clamping plate; the upper right clamping plate and the lower right clamping plate are locked by a right connecting mechanism, and positioning grooves for clamping ultra-high voltage smooth metal sheathed cables are formed between the upper left clamping plate and the lower left clamping plate and between the upper right clamping plate and the lower right clamping plate.

[0008] As a preferred solution of the present invention, the left connecting mechanism includes a left holed bolt and a left fixing pin; the left upper clamp is provided with a left upper positioning groove with a vertical axis and an open end, the left holed bolt is installed in the left upper positioning groove, the left upper clamp is provided with a left fastening hole with a horizontal axis, the left fastening hole passes through to the left upper positioning groove, and the left fixing pin is respectively inserted into the left fastening hole and the left upper positioning groove to position the left holed bolt in the left upper positioning groove of the left upper clamp.

[0009] As a preferred solution of the present invention, the bottom of the left hole bolt is connected to the left lower clamp plate, wherein the left lower clamp plate is provided with a left lower positioning groove with a vertical axis and an open end, and a left dovetail nut is rotatably installed on the left hole bolt. When the left hole bolt is accommodated in the left lower positioning groove, the left dovetail nut rotates and abuts against the bottom of the left lower clamp plate, so as to fasten the ultra-high voltage smooth metal sheathed cable between the left upper clamp plate and the left lower clamp plate.

[0010] As a preferred solution of the present invention, the right connecting mechanism includes a right holed bolt and a right fixing pin; the right upper clamping plate is provided with a right upper positioning groove with a vertical axis and an open end, the right holed bolt is installed in the right upper positioning groove, the right upper clamping plate is provided with a right fastening hole with a horizontal axis, the right fastening hole passes through to the upper right positioning groove, and the right fixing pin is respectively inserted into the right fastening hole and the upper right positioning groove to position the right holed bolt in the upper right positioning groove of the right upper clamping plate.

[0011] As a preferred solution of the present invention, the bottom of the right hole bolt is connected to the right lower clamp plate, wherein the right lower clamp plate is provided with a right lower positioning groove with a vertical axis and an open end, and a right dovetail nut is rotatably installed on the right hole bolt. When the right hole bolt is accommodated in the right lower positioning groove, the right dovetail nut rotates and abuts against the bottom of the right lower clamp plate, so as to fasten the ultra-high voltage smooth metal sheathed cable between the right upper clamp plate and the right lower clamp plate.

[0012] As a preferred solution of the present invention, the fixed platform includes a horizontal plate and support plates vertically arranged on both sides of the horizontal plate; a left arc-shaped clamping portion is formed in the middle of the upper left clamping plate and the lower left clamping plate, and a right arc-shaped clamping portion is formed in the middle of the upper right clamping plate and the lower right clamping plate, respectively, and the two support plates are fixed between the left arc-shaped clamping portion and the right arc-shaped clamping portion.

[0013] As a preferred solution of the present invention, the horizontal plate is fixedly connected to the support plate and formed as one piece, wherein the left guide groove opening and the right guide groove opening are located in the middle of the horizontal plate.

[0014] As a preferred solution of the present invention, a suspended fixing bracket is fixedly provided at the bottom of the horizontal plate, and the suspended fixing bracket abuts against the middle of the left arc-shaped clamping part and the right arc-shaped clamping part.

[0015] As a preferred solution of the present invention, the length of the left guide slot opening and the right guide slot opening is L, wherein L is the distance between the inner side wall of the left upper clamping plate and the inner side wall of the right upper clamping plate.

[0016] A sampling method for a metal sheath sampling device of an ultra-high voltage metal sheath cable comprises the following steps:

[0017] Step S1: Install the sampling device, and place the ultra-high voltage smooth metal sheathed cable to be sampled between the upper left clamping plate and the lower left clamping plate and between the upper right clamping plate and the lower right clamping plate, and lock and position it through the left connecting mechanism and the right connecting mechanism;

[0018] Step S2: using a small cutting machine to cut a section of the ultra-high voltage smooth metal sheath cable sheath through the left guide slot and the right guide slot, and cutting a suitable length according to the test items;

[0019] Step S3: Cut off a predetermined length of the metal sheath at both ends of the metal sheath of the ultra-high voltage smooth metal sheath cable, and keep the metal sheath and outer sheath of the ultra-high voltage metal sheath cable required for the test, which is the metal sheath sample;

[0020] Step S4: The metal sheath sample in step S3 is used for tensile comparison of the metal sheath weld and adhesion test between the smooth metal sheath and the outer sheath.

[0021] The beneficial effects of the present invention are as follows: the present invention has a simple structure and an ingenious design. Compared with the prior art, the device of the present invention replaces manual labor and adopts a longitudinal cable metal sheath sampling device, which can save costs, reduce waste, improve the reliability and accuracy of cable sampling, and is adaptable to cables of different diameters. When the device is used for cable sampling, it is simple to operate, easy to use, and has high operational safety, which can reduce injuries to personnel during operation. At the same time, it can effectively control the cutting depth of the metal sheath to avoid damage to the cable core. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic cross-sectional structural diagram of an embodiment of the present invention.

[0023] Figure 2 2 is a schematic diagram of a top view of the structure of an embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of the structure of the lower left splint according to an embodiment of the present invention.

[0025] Figure 4 It is a schematic diagram of the structure of the lower right splint of an embodiment of the present invention.

[0026] Reference numerals in the figure: upper left clamping plate 1, left fixing pin 2, left bolt with hole 3, fixing platform 4, left guide slot 5, right guide slot 6, suspended fixing bracket 7, left dovetail nut 8, lower left clamping plate 9, upper right clamping plate 10, right fixing pin 11, right bolt with hole 12, right dovetail nut 13, lower right clamping plate 14, ultra-high voltage smooth metal sheathed cable 15, positioning groove 16, left arc-shaped clamping part 17, right arc-shaped clamping part 18, left connecting mechanism 20, upper left positioning groove 21, left fastening hole 22, lower left positioning groove 23, right connecting mechanism 30, upper right positioning groove 31, right fastening hole 32, lower right positioning groove 33, horizontal plate 40, support plate 41. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Example:

[0030] like Figure 1-4 As shown, this embodiment discloses a metal sheath sampling device for an ultra-high voltage metal sheathed cable, comprising a fixed platform 4, and an upper left clamping plate 1 and an upper right clamping plate 10 respectively installed on both sides of the fixed platform 4; a left guide slot 5 and a right guide slot 6 are symmetrically arranged on the fixed platform 4 along its length direction; a suspended fixed bracket 7 is arranged between the left guide slot 5 and the right guide slot 6; a lower left clamping plate 9 is correspondingly installed at the bottom of the upper left clamping plate 1; the upper left clamping plate 1 and the lower left clamping plate 9 are locked by a left connecting mechanism 20, and a lower right clamping plate 14 is correspondingly installed at the bottom of the upper right clamping plate 10; the upper right clamping plate 10 and the lower right clamping plate 14 are locked by a right connecting mechanism 30, and a positioning groove 16 for clamping an ultra-high voltage smooth metal sheathed cable 15 is formed between the upper left clamping plate 1 and the lower left clamping plate 9 and between the upper right clamping plate 10 and the lower right clamping plate 14.

[0031] The fixed platform 4, the upper left clamping plate 1 and the upper right clamping plate 10 form a positioning cutting platform. The left side of the cutting platform locks the ultra-high voltage smooth metal sheathed cable 15 through the lower left clamping plate 9, the left hole bolt 3 and the left dovetail nut 8. The right side of the positioning cutting platform is fixedly installed with the right hole bolt 12 through the right fixing pin 11 installed on the upper right clamping plate 10, forming a movable left-side fastening bolt mechanism.

[0032] The present invention has a simple structure and an ingenious design. Compared with the prior art, the device of the present invention replaces manual labor and adopts a longitudinal cable metal sheath sampling device, which can save costs, reduce waste, improve the reliability and accuracy of cable sampling, and is adaptable to cables of different diameters. When the device is used for cable sampling, it is simple to operate, easy to use, and has high operational safety, which can reduce injuries to personnel during operation. At the same time, it can effectively control the cutting depth of the metal sheath to avoid damage to the cable core.

[0033] Specifically, the left connecting mechanism 20 includes a left hole bolt 3 and a left fixing pin 2; the left upper clamp plate 1 is provided with a left upper positioning groove 21 with a vertical axis and an open end, the left hole bolt 3 is installed in the left upper positioning groove 21, and the left upper clamp plate 1 is provided with a left fastening hole 22 with a horizontal axis, the left fastening hole 22 passes through to the left upper positioning groove 21, and the left fixing pin 2 is respectively inserted into the left fastening hole 22 and the left upper positioning groove 21 to position the left hole bolt 3 in the left upper positioning groove 21 of the left upper clamp plate 1.

[0034] The bottom of the left bolt with a hole 3 is connected to the left lower clamping plate 9, wherein the left lower clamping plate 9 is provided with a left lower positioning groove 23 with a vertical axis and an open end, and a left dovetail nut 8 is rotatably mounted on the left bolt with a hole 3. When the left bolt with a hole 3 is accommodated in the left lower positioning groove 23, the left dovetail nut 8 rotates and abuts against the bottom of the left lower clamping plate 9, and is used to fasten the ultra-high voltage smooth metal sheath cable 15 between the left upper clamping plate 1 and the left lower clamping plate 9. By rotating the left dovetail nut 8 on the left bolt with a hole 3, the distance between the left upper clamping plate 1 and the left lower clamping plate 9 can be adjusted, which is suitable for clamping ultra-high voltage smooth metal sheath cables 15 of different specifications.

[0035] The right connecting mechanism 30 includes a right holed bolt 12 and a right fixing pin 11; the right upper clamping plate 10 is provided with a right upper positioning groove 31 with a vertical axis and an open end, the right holed bolt 12 is installed in the right upper positioning groove 31, and the right upper clamping plate 10 is provided with a right fastening hole 32 with a horizontal axis, the right fastening hole 32 passes through to the upper positioning groove 31, and the right fixing pin 11 is respectively inserted into the right fastening hole 32 and the upper positioning groove 31 to position the right holed bolt 12 in the upper positioning groove 31 of the right upper clamping plate 10.

[0036] Among them, the bottom of the right hole bolt 12 is connected to the right lower clamping plate 14, wherein the right lower clamping plate 14 is provided with a right lower positioning groove 33 with a vertical axis and an open end, and the right dovetail nut 13 is rotatably installed on the right hole bolt 12. When the right hole bolt 12 is accommodated in the right lower positioning groove 33, the right dovetail nut 13 rotates and abuts against the bottom of the right lower clamping plate 14, which is used to fasten the ultra-high voltage smooth metal sheath cable 15 between the right upper clamping plate 10 and the right lower clamping plate 14; by rotating the right dovetail nut 13 on the right hole bolt 12, the specific position between the right upper clamping plate 10 and the right lower clamping plate 14 can be adjusted, which is suitable for clamping ultra-high voltage smooth metal sheath cables 15 of different specifications.

[0037] The fixed platform 4 includes a horizontal plate 40 and support plates 41 vertically arranged on both sides of the horizontal plate 40; a left arc-shaped clamping portion 17 is formed in the middle of the upper left clamping plate 1 and the lower left clamping plate 9, and a right arc-shaped clamping portion 18 is formed in the middle of the upper right clamping plate 10 and the lower right clamping plate 14, respectively; the two support plates 41 are fixed between the left arc-shaped clamping portion 17 and the right arc-shaped clamping portion 18, respectively.

[0038] The horizontal plate 40 is fixedly connected to the support plate 41 and formed as one piece, which improves the structural strength and overall firmness of the entire fixed platform 4 and further ensures safety in use. The left guide slot 5 and the right guide slot 6 are located in the middle of the horizontal plate 40. A suspended fixed bracket 7 is fixedly provided at the bottom of the horizontal plate 40, and the suspended fixed bracket 7 rests against the middle of the left arc-shaped clamping portion 17 and the right arc-shaped clamping portion 18.

[0039] The length of the left guide slot opening 5 and the right guide slot opening 6 is L, wherein L is the distance between the inner wall of the left upper clamp plate 1 and the inner wall of the right upper clamp plate 10; the left guide slot opening 5 and the right guide slot opening 6 are positioned by the left / right guide slot length L, the guide slot opening width L1, the left guide slot opening width K1, and the right guide slot opening width K2, and the conventional small cutting machine on the market is used to realize the directional sampling of the metal sheath of the ultra-high voltage metal sheathed cable.

[0040] A sampling method for a metal sheath sampling device of an ultra-high voltage metal sheath cable comprises the following steps:

[0041] Step S1: Install the sampling device, and place the ultra-high voltage smooth metal sheathed cable 15 to be sampled between the upper left clamping plate 1 and the lower left clamping plate 9 and between the upper right clamping plate 10 and the lower right clamping plate 14, and lock and position them through the left connecting mechanism 20 and the right connecting mechanism 30;

[0042] Step S2: using a small cutting machine to cut a section of the sheath of the ultra-high voltage smooth metal sheathed cable 15 through the left guide slot 5 and the right guide slot 6, and cutting a suitable length according to the test items;

[0043] Step S3: Cut off the metal sheath of a predetermined length at both ends of the metal sheath of the ultra-high voltage smooth metal sheath cable 15, and keep the metal sheath and outer sheath of the ultra-high voltage metal sheath cable required for the test, which is the metal sheath sample;

[0044] Step S4: The metal sheath sample in step S3 is used for tensile comparison of the metal sheath weld and adhesion test between the smooth metal sheath and the outer sheath.

[0045] The present invention provides a sampling method for a metal sheath sampling device for an ultra-high voltage metal sheath cable, which can be adapted to an ultra-high voltage cable metal sheath sampling device for cables of different diameters. The sampling method utilizes a conventional small cutting machine on the market to separate the ultra-high voltage metal sheath cable from the metal sheath required for the test through the device, thereby facilitating the interception of samples. At the same time, the metal sheath sample can be obtained without damaging the metal sheath and the ultra-high voltage metal sheath cable, thereby improving the reliability and accuracy of the metal sheath test results.

[0046] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0047] Although the present invention uses more reference numerals in the figures: left upper clamping plate 1, left fixing pin 2, left bolt with hole 3, fixing platform 4, left guide slot 5, right guide slot 6, suspended fixing bracket 7, left dovetail nut 8, left lower clamping plate 9, right upper clamping plate 10, right fixing pin 11, right bolt with hole 12, right dovetail nut 13, right lower clamping plate 14, ultra-high voltage smooth metal sheath cable 15, positioning groove 16, left arc clamping part 17, right arc clamping part 18, left connecting mechanism 20, left upper positioning groove 21, left fastening hole 22, left lower positioning groove 23, right connecting mechanism 30, right upper positioning groove 31, right fastening hole 32, right lower positioning groove 33, horizontal plate 40, support plate 41, etc., the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A sampling device for metal sheath of ultra-high voltage metal sheathed cable, characterized in that: The invention comprises a fixed platform (4), a left upper clamping plate (1) and a right upper clamping plate (10) respectively mounted on both sides of the fixed platform (4); a left guide slot (5) and a right guide slot (6) are symmetrically arranged on the fixed platform (4) along its length direction; a suspended fixed bracket (7) is arranged between the left guide slot (5) and the right guide slot (6); a left lower clamping plate (9) is correspondingly mounted on the bottom of the left upper clamping plate (1); the left upper clamping plate (1) and the left lower clamping plate (9) are locked by a left connecting mechanism (20); a right lower clamping plate (14) is correspondingly mounted on the bottom of the right upper clamping plate (10); the right upper clamping plate (10) and the right lower clamping plate ( The upper left clamping plate (1) and the lower left clamping plate (9) are locked by a right connecting mechanism (30); a positioning groove (16) for clamping an ultra-high voltage smooth metal sheathed cable (15) is formed between the upper left clamping plate (1) and the lower left clamping plate (9) and between the upper right clamping plate (10) and the lower right clamping plate (14); the left connecting mechanism (20) comprises a left bolt with a hole (3) and a left fixing pin (2); the upper left clamping plate (1) is provided with a left positioning groove (21) with a vertical axis and an open end, the left bolt with a hole (3) is installed in the upper left positioning groove (21), the upper left clamping plate (1) is provided with a left fastening hole (22) with a horizontal axis, the left The fastening hole (22) passes through the upper left positioning groove (21), and the left fixing pin (2) is respectively inserted into the left fastening hole (22) and the upper left positioning groove (21) to position the left hole bolt (3) in the upper left positioning groove (21) of the upper left clamping plate (1); the bottom of the left hole bolt (3) is connected to the lower left clamping plate (9), wherein the lower left clamping plate (9) is provided with a lower left positioning groove (23) with a vertical axis and an open end, and a left dovetail nut (8) is rotatably mounted on the left hole bolt (3), and when the left hole bolt (3) is accommodated in the lower left positioning groove (23), the left dovetail nut (8) is rotated The fixing platform (4), the upper left clamping plate (1) and the upper right clamping plate (10) form a positioning cutting platform. The left side of the cutting platform locks the ultra-high voltage smooth metal sheathed cable (15) through the lower left clamping plate (9), the left hole bolt (3) and the left dovetail nut (8). The right side of the positioning cutting platform is fixedly installed by the right fixing pin (11) installed on the upper right clamping plate (10), thereby forming a movable left-side fastening bolt mechanism.

2. The ultra-high voltage metal sheath cable metal sheath sampling device according to claim 1, characterized in that: The right connecting mechanism (30) comprises a right bolt with a hole (12) and a right fixing pin (11); the right upper clamping plate (10) is provided with a right upper positioning groove (31) with a vertical axis and an open end, the right bolt with a hole (12) is installed in the right upper positioning groove (31), the right upper clamping plate (10) is provided with a right fastening hole (32) with a horizontal axis, the right fastening hole (32) passes through the right upper positioning groove (31), and the right fixing pin (11) is respectively inserted into the right fastening hole (32) and the right upper positioning groove (31) to position the right bolt with a hole (12) in the right upper positioning groove (31) of the right upper clamping plate (10).

3. The ultra-high voltage metal sheath cable metal sheath sampling device according to claim 2, characterized in that: The bottom of the right hole bolt (12) is connected to the right lower clamping plate (14), wherein the right lower clamping plate (14) is provided with a right lower positioning groove (33) with a vertical axis and an open end, and a right dovetail nut (13) is rotatably mounted on the right hole bolt (12). When the right hole bolt (12) is accommodated in the right lower positioning groove (33), the right dovetail nut (13) rotates and abuts against the bottom of the right lower clamping plate (14), so as to fasten the ultra-high voltage smooth metal sheathed cable (15) between the right upper clamping plate (10) and the right lower clamping plate (14).

4. The ultra-high voltage metal sheath cable metal sheath sampling device according to claim 1, characterized in that: The fixed platform (4) comprises a horizontal plate (40) and support plates (41) arranged vertically on both sides of the horizontal plate (40); a left arc-shaped clamping portion (17) is formed in the middle of the upper left clamping plate (1) and the lower left clamping plate (9), and a right arc-shaped clamping portion (18) is formed in the middle of the upper right clamping plate (10) and the lower right clamping plate (14); and the two support plates (41) are fixedly arranged between the left arc-shaped clamping portion (17) and the right arc-shaped clamping portion (18).

5. The ultra-high voltage metal sheath cable metal sheath sampling device according to claim 4, characterized in that: The horizontal plate (40) is fixedly connected to the support plate (41) and is integrally formed, wherein the left guide slot opening (5) and the right guide slot opening (6) are located in the middle of the horizontal plate (40).

6. The ultra-high voltage metal sheath cable metal sheath sampling device according to claim 5, characterized in that: A suspended fixing bracket (7) is fixedly provided at the bottom of the horizontal plate (40), and the suspended fixing bracket (7) abuts against the middle of the left arc-shaped clamping portion (17) and the right arc-shaped clamping portion (18).

7. The ultra-high voltage metal sheath cable metal sheath sampling device according to claim 6, characterized in that: The length of the left guide slot opening (5) and the right guide slot opening (6) is L, wherein L is the distance between the inner side wall of the left upper clamping plate (1) and the inner side wall of the right upper clamping plate (10).

8. A sampling method for the metal sheath sampling device of an ultra-high voltage metal sheathed cable according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1: Install the sampling device, and place the ultra-high voltage smooth metal sheathed cable (15) to be sampled between the upper left clamping plate (1) and the lower left clamping plate (9) and between the upper right clamping plate (10) and the lower right clamping plate (14), and lock and position them through the left connecting mechanism (20) and the right connecting mechanism (30); Step S2: using a small cutting machine to cut a section of the sheath of the ultra-high voltage smooth metal sheathed cable (15) through the left guide slot (5) and the right guide slot (6), and cutting a suitable length according to the test items; Step S3: cutting off a predetermined length of the metal sheath at both ends of the metal sheath of the ultra-high voltage smooth metal sheath cable (15), and retaining the metal sheath and outer sheath of the ultra-high voltage metal sheath cable required for the test, i.e., the metal sheath sample; Step S4: The metal sheath sample in step S3 is used for tensile comparison of the metal sheath weld and adhesion test between the smooth metal sheath and the outer sheath.

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